Hi Mohawk,
I too have had the same error occur with the beta but for a slightly different reason. I was testing the ability of the Beta to render ultra high resolution images (70000 x 10000) and got the same kind of error, I posted the necessary files to the Planetside support email: I post part of the reply email if it will help, though your circumstances maybe different:
"As I believe you are aware, any rendered image must currently be kept entirely in memory in order to be rendered. An image of this size will exceed available memory and cause a memory-related crash very quickly, no matter how much RAM you have, because of the limitations of 32 bit applications like TG2. Once TG2 is upgraded to be 64 bit it may theoretically be able to handle an image of this size, assuming you had enough RAM, but this is a very unlikely scenario, and the render time would be so high as to be practically impossible."
Hope that helps, if not it maybe some thing else. If you like PM me you details and I'll see if I could render your image at the required resolution if you like, but if this is to complicated due to plant models and related file paths then I understand.
Regards to you.
Cyber-Angel
Regards to you